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  2. Resistive opto-isolator - Wikipedia

    en.wikipedia.org/wiki/Resistive_opto-isolator

    Opto-isolator VTL2C1 with LED input and photoresistor output. Resistive opto-isolator (RO), also called photoresistive opto-isolator, vactrol (after a genericized trademark introduced by Vactec, Inc. in the 1960s), analog opto-isolator [notes 1] or lamp-coupled photocell, [1] is an optoelectronic device consisting of a source and detector of light, which are optically coupled and electrically ...

  3. craigslist - Wikipedia

    en.wikipedia.org/wiki/Craigslist

    Craigslist headquarters in the Inner Sunset District of San Francisco prior to 2010. The site serves more than 20 billion [17] page views per month, putting it in 72nd place overall among websites worldwide and 11th place overall among websites in the United States (per Alexa.com on June 28, 2016), with more than 49.4 million unique monthly visitors in the United States alone (per Compete.com ...

  4. Selenium meter - Wikipedia

    en.wikipedia.org/wiki/Selenium_meter

    The most common use of such light meters is measuring the exposure value for photography. The electric part of such a meter is an electromagnetic measuring instrument which is connected to the anode and cathode of a selenium photo cell that produces more or less electric power when exposed to more or less light. The optical part of such a meter ...

  5. History of street lighting in the United States - Wikipedia

    en.wikipedia.org/wiki/History_of_street_lighting...

    Although the tower lighting in Detroit provided "uniform carpets of light", it was ineffective in providing sufficient lighting for high-traffic areas and routes. After five years, Detroit began to dismantle its towers. [1] As of October 2021, the only lighting towers that remain in the United States are in Austin, Texas.

  6. Photoresistor - Wikipedia

    en.wikipedia.org/wiki/Photoresistor

    Three photoresistors with scale in mm Large CdS photocell from a street light. A photoresistor is less light-sensitive than a photodiode or a phototransistor.The latter two components are true semiconductor devices, while a photoresistor is a passive component that does not have a PN-junction.

  7. Photoelectric sensor - Wikipedia

    en.wikipedia.org/wiki/Photoelectric_sensor

    Conceptual through-beam system to detect unauthorized access to a secure door. If the beam is interrupted, the detector triggers an alarm. A photoelectric sensor is a device used to determine the distance, absence, or presence of an object by using a light transmitter, often infrared, and a photoelectric receiver.

  8. Solar street light - Wikipedia

    en.wikipedia.org/wiki/Solar_street_light

    LEDs are usually used as the primary lighting source of modern solar street lights, as the LED will provide much higher luminosity with lower energy consumption. The energy consumption of an LED fixture is at least 50% lower than the HPS fixture counterpart which is widely used as the lighting source in traditional street lights.

  9. Parking lot - Wikipedia

    en.wikipedia.org/wiki/Parking_lot

    Diagram of example parking lot layout with angle parking as seen from above A parking lot in Manhattan, New York City, in 2010, with its capacity increased through multiple level stacked parking using mechanical lifts A subterranean parking lot of a Brazilian shopping mall taken in 2016 A sign at the entrance to an underground parking garage in March 2007, warning drivers of the maximum height ...

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